| Lighthouse School | 5.3 |
Special education | Pre-KG-12 | 220 | 6.7 | Nonsectarian |
| Seven Hills At Groton | 5.9 |
Special education | 1-12 | 25 | 8.3 | Nonsectarian |
| Merrimack Schools | 6.9 |
Alternative/other | 5-12 | 55 | 2.5 | Nonsectarian |
| Riverside School | 7.4 |
Special education | 2-12 | 34 | 4.9 | Nonsectarian |
| Pepperell Christian Academy | 7.5 |
Regular elementary or secondary | Pre-KG-12 | 29 | 5.5 | Baptist |
| Seven Hills Academy | 8.9 |
Special education | 4-12 | 60 | 14.6 | Nonsectarian |
| Mary Mcleod Bethune Institute | 10.1 |
Special program emphasis | 3-12 | 45 | 8.0 | Nonsectarian |
| The Fenn School | 10.2 |
Regular elementary or secondary | 4-9 | 304 | 8.2 | Nonsectarian |
| Melmark New England | 12.0 |
Special education | Ungraded-Ungraded | 108 | 1.5 | Nonsectarian |
| Willow Hill School | 12.9 |
Special education | 6-12 | 60 | 3.4 | Nonsectarian |
| Rfk Lancaster School | 14.5 |
Special education | 4-12 | 36 | 1.1 | Nonsectarian |
| Twin City Christian School | 14.6 |
Regular elementary or secondary | Pre-KG-12 | 191 | 12.2 | Baptist |
| South Lancaster Academy And Browning Elementary | 15.2 |
Regular elementary or secondary | Pre-KG-12 | 237 | 15.0 | Seventh-Day Adventist |
| St Ann's Home Inc | 15.7 |
Special education | Ungraded-Ungraded | 122 | 6.7 | Nonsectarian |
| Fellowship Christian Academy | 16.0 |
Regular elementary or secondary | Pre-KG-12 | 108 | 10.8 | Christian (no specific denomination) |
| Community Therapeutic Day School Inc | 16.3 |
Special education | Ungraded-Ungraded | 30 | 2.6 | Nonsectarian |
| Open Bible Academy | 16.7 |
Regular elementary or secondary | Pre-KG-12 | 71 | 6.2 | Christian (no specific denomination) |
| Cotting School | 16.8 |
Special education | Ungraded-Ungraded | 119 | 4.8 | Nonsectarian |
| The Pike School | 17.0 |
Regular elementary or secondary | Pre-KG-9 | 418 | 9.1 | Nonsectarian |
| Applewild School | 17.4 |
Regular elementary or secondary | KG-9 | 282 | 7.8 | Nonsectarian |
| Lexington Christian Academy | 17.7 |
Regular elementary or secondary | 6-12 | 345 | 9.9 | Christian (no specific denomination) |
| Hillside School | 18.3 |
Regular elementary or secondary | 5-9 | 139 | 6.0 | Nonsectarian |
| The Gifford School | 18.4 |
Special education | 4-12 | 106 | 4.8 | Nonsectarian |
| Sterling Nursery School | 18.5 |
Special education | Pre-KG-Pre-KG | 3 | 0.8 | Nonsectarian |
| Germaine Lawrence | 18.6 |
Alternative/other | 6-12 | 50 | 4.5 | Nonsectarian |
| Reed Academy | 18.8 |
Special education | Ungraded-Ungraded | 20 | 3.4 | Nonsectarian |
| Sudbury Valley School | 18.8 |
Special program emphasis | Ungraded-Ungraded | 165 | 16.7 | Nonsectarian |
| Protestant Guild For Human Services | 19.6 |
Special education | Ungraded-Ungraded | 60 | 6.1 | Nonsectarian |
| Protestant Guild Learning Center | 19.6 |
Special education | 5-12 | 38 | 2.3 | Nonsectarian |
| The Learning Center For The Deaf | 20.0 |
Special education | Pre-KG-12 | 184 | 4.3 | Nonsectarian |
| Brandon Residential Treatment | 20.1 |
Special education | 1-11 | 74 | 5.9 | Nonsectarian |
| The Rivers School | 20.1 |
Regular elementary or secondary | 6-12 | 433 | 7.5 | Nonsectarian |
| Fay School | 20.3 |
Regular elementary or secondary | 1-9 | 379 | 6.6 | Nonsectarian |
| Crossroad Center For Children | 20.5 |
Special education | Ungraded-Ungraded | 40 | 5.7 | Nonsectarian |
| Fessenden School | 20.5 |
Regular elementary or secondary | KG-9 | 482 | 7.3 | Nonsectarian |
| New England Center For Children | 20.7 |
Special education | Pre-KG-12 | 191 | 2.3 | Nonsectarian |
| Edgewood Elementary School/gba | 20.8 |
Regular elementary or secondary | Pre-KG-12 | 94 | 8.9 | Seventh-Day Adventist |
| Learning Prep School | 20.9 |
Special education | Ungraded-Ungraded | 403 | 2.8 | Nonsectarian |
| Clearway School | 21.0 |
Special education | 6-12 | 25 | 2.8 | Nonsectarian |
| Dearborn Academy | 21.0 |
Special education | 3-12 | 110 | 1.4 | Nonsectarian |
| Bradford Christian Academy | 21.1 |
Regular elementary or secondary | 6-12 | 65 | 7.4 | Christian (no specific denomination) |
| International School Of Boston | 21.6 |
Regular elementary or secondary | Pre-KG-12 | 452 | 4.1 | Nonsectarian |
| New England Christian Academy | 21.9 |
Regular elementary or secondary | KG-10 | 15 | 6.2 | Christian (no specific denomination) |
| Newton Country Day School | 22.3 |
Regular elementary or secondary | 5-12 | 394 | 5.6 | Roman Catholic |
| Melrose Montessori School | 22.4 |
Montessori | Ungraded-Ungraded | 41 | 10.2 | Nonsectarian |
| Buckingham Browne & Nichols School | 22.8 |
Regular elementary or secondary | Pre-KG-12 | 938 | 7.2 | Nonsectarian |
| Dana Hall School | 22.8 |
Regular elementary or secondary | 6-12 | 485 | 9.2 | Nonsectarian |
| Kennedy Day School Program | 23.5 |
Special education | Ungraded-Ungraded | 74 | 3.7 | Nonsectarian |
| Covenant Christian Academy | 24.0 |
Regular elementary or secondary | Pre-KG-10 | 186 | 6.1 | Christian (no specific denomination) |
| Brimmer And May School | 24.2 |
Regular elementary or secondary | Pre-KG-12 | 378 | 8.7 | Nonsectarian |
| Beaver Country Day School | 24.6 |
Regular elementary or secondary | 6-12 | 419 | 8.6 | Nonsectarian |
| Meridian Academy | 24.9 |
Regular elementary or secondary | 6-9 | 27 | 6.6 | Nonsectarian |
